clk: Move of_clk_*() APIs into clk.c from clkdev.c

The API between clk.c and clkdev.c is purely getting the clk_hw
structure (or the struct clk if it's not CCF) and then turning that
struct clk_hw pointer into a struct clk pointer via clk_hw_create_clk().
There's no need to complicate clkdev.c with these DT parsing details
that are only relevant to the common clk framework. Move the DT parsing
logic into the core framework and just expose the APIs to get a clk_hw
pointer and convert it.

Cc: Miquel Raynal <miquel.raynal@bootlin.com>
Cc: Jerome Brunet <jbrunet@baylibre.com>
Cc: Russell King <linux@armlinux.org.uk>
Cc: Michael Turquette <mturquette@baylibre.com>
Cc: Jeffrey Hugo <jhugo@codeaurora.org>
Cc: Chen-Yu Tsai <wens@csie.org>
Signed-off-by: Stephen Boyd <sboyd@kernel.org>

1 files changed, 54 insertions, 3 deletions

diff --git a/drivers/clk/clk.c b/drivers/clk/clk.c
index 8244ef2ba977..937b8d092d17 100644
--- a/drivers/clk/clk.c
+++ b/drivers/clk/clk.c
@@ -4068,8 +4068,8 @@ void devm_of_clk_del_provider(struct device *dev)
 }
 EXPORT_SYMBOL(devm_of_clk_del_provider);
 
-int of_parse_clkspec(const struct device_node *np, int index, const char *name,
-		     struct of_phandle_args *out_args)
+static int of_parse_clkspec(const struct device_node *np, int index,
+			    const char *name, struct of_phandle_args *out_args)
 {
 	int ret = -ENOENT;
 
@@ -4119,7 +4119,8 @@ __of_clk_get_hw_from_provider(struct of_clk_provider *provider,
 	return __clk_get_hw(clk);
 }
 
-struct clk_hw *of_clk_get_hw_from_clkspec(struct of_phandle_args *clkspec)
+static struct clk_hw *
+of_clk_get_hw_from_clkspec(struct of_phandle_args *clkspec)
 {
 	struct of_clk_provider *provider;
 	struct clk_hw *hw = ERR_PTR(-EPROBE_DEFER);
@@ -4156,6 +4157,56 @@ struct clk *of_clk_get_from_provider(struct of_phandle_args *clkspec)
 }
 EXPORT_SYMBOL_GPL(of_clk_get_from_provider);
 
+struct clk_hw *of_clk_get_hw(struct device_node *np, int index,
+			     const char *con_id)
+{
+	int ret;
+	struct clk_hw *hw;
+	struct of_phandle_args clkspec;
+
+	ret = of_parse_clkspec(np, index, con_id, &clkspec);
+	if (ret)
+		return ERR_PTR(ret);
+
+	hw = of_clk_get_hw_from_clkspec(&clkspec);
+	of_node_put(clkspec.np);
+
+	return hw;
+}
+
+static struct clk *__of_clk_get(struct device_node *np,
+				int index, const char *dev_id,
+				const char *con_id)
+{
+	struct clk_hw *hw = of_clk_get_hw(np, index, con_id);
+
+	return clk_hw_create_clk(NULL, hw, dev_id, con_id);
+}
+
+struct clk *of_clk_get(struct device_node *np, int index)
+{
+	return __of_clk_get(np, index, np->full_name, NULL);
+}
+EXPORT_SYMBOL(of_clk_get);
+
+/**
+ * of_clk_get_by_name() - Parse and lookup a clock referenced by a device node
+ * @np: pointer to clock consumer node
+ * @name: name of consumer's clock input, or NULL for the first clock reference
+ *
+ * This function parses the clocks and clock-names properties,
+ * and uses them to look up the struct clk from the registered list of clock
+ * providers.
+ */
+struct clk *of_clk_get_by_name(struct device_node *np, const char *name)
+{
+	if (!np)
+		return ERR_PTR(-ENOENT);
+
+	return __of_clk_get(np, -1, np->full_name, name);
+}
+EXPORT_SYMBOL(of_clk_get_by_name);
+
 /**
  * of_clk_get_parent_count() - Count the number of clocks a device node has
  * @np: device node to count